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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/13356

Title: Yarn twist measurement using digital imaging
Authors: Ozkaya, Yasar A.
Acar, Memis
Jackson, Michael R.
Keywords: Yarn twist
Digital imaging
Twist angle
Yarn diameter
Issue Date: 2010
Publisher: Taylor and Francis / © The Textile Institute
Citation: OZKAYA, Y.A., ACAR, M. and JACKSON, M.R., 2010. Yarn twist measurement using digital imaging. Journal of the Textile Industry, 101 (2), pp. 91 - 100.
Abstract: Digital image analysis techniques in the spatial and frequency domains for twist measurement of yarns are described. A spatial technique is developed to extract the twist angle through the analysis of the yarn core image. Then, a Fourier transformation technique is applied to yarn images to measure the orientation of the fibre on the yarn surface. Finally, a hybrid method that incorporates frequency domain filtering prior to spatial analysis is proposed. The trials show that spatial analysis is a fast method and can successfully predict the twist in the yarn. Fourier transformation technique is quite sensitive to the protruding fibres obstructing the yarn surface, which may result in measurements having high variations. For yarns having little amount of hairs protruding from the core, the results agreed reasonably well with actual twist levels. Frequency domain filtering in conjunction with the spatial analysis of the yarn surface is found to be superior in terms of accuracy. The twist values calculated using the more reliable diameter measurements with back-lit images together with twist angles from the front-lit images are found to be more accurate when compared with the actual values.
Description: This article was published in the serial, Journal of the Textile Institute [Taylor and Francis / © The Textile Institute]. The definitive version is available at: http://dx.doi.org/10.1080/00405000802263476
Version: Accepted for publication
DOI: 10.1080/00405000802263476
URI: https://dspace.lboro.ac.uk/2134/13356
Publisher Link: http://dx.doi.org/10.1080/00405000802263476
ISSN: 0040-5000
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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